backyard free stacked rock wall - no mortar- Local river rock- This type of rock wall was used to control flood waters in the citrus groves that dominated the inland empire area from the late 1800's until the 1960's. these walls rely on gravity and the method of placing the rocks for their lasting strength. There is no hydrostatic pressure behind the wall as water can flow through. Landscape fabric and rubble is used to keep the backfill from coming through.
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